Find a percentage based on multiple columns of criteria in R

Question

I have multiple columns and I would like to find the percentage of a one column in the other columns are the same. For example;

ST  cd  variable
1   1   23432
1         


        

Answer 1

You can create your proportion format function:

prop_format <- 
function (x, digits=4) 
{
  x <- round(x/sum(x), digits)*100
  paste0(x,'%')
}

Then using ave :

ave(dt$variable,list(dt$ST,dt$cd),FUN=prop_format)

[1] "90.9%"  "9.1%"   "25.23%" "9.73%"  "65.05%" "29.91%" "70.09%"